use crate::off_t;
use crate::prelude::*;

pub type mode_t = u16;
pub type pthread_attr_t = *mut c_void;
pub type rlim_t = i64;
pub type pthread_mutex_t = *mut c_void;
pub type pthread_mutexattr_t = *mut c_void;
pub type pthread_cond_t = *mut c_void;
pub type pthread_condattr_t = *mut c_void;
pub type pthread_rwlock_t = *mut c_void;
pub type pthread_rwlockattr_t = *mut c_void;
pub type pthread_key_t = c_int;
pub type tcflag_t = c_uint;
pub type speed_t = c_uint;
pub type nl_item = c_int;
pub type id_t = i64;
pub type vm_size_t = crate::uintptr_t;
pub type key_t = c_long;

// elf.h

pub type Elf32_Addr = u32;
pub type Elf32_Half = u16;
pub type Elf32_Lword = u64;
pub type Elf32_Off = u32;
pub type Elf32_Sword = i32;
pub type Elf32_Word = u32;

pub type Elf64_Addr = u64;
pub type Elf64_Half = u16;
pub type Elf64_Lword = u64;
pub type Elf64_Off = u64;
pub type Elf64_Sword = i32;
pub type Elf64_Sxword = i64;
pub type Elf64_Word = u32;
pub type Elf64_Xword = u64;

pub type iconv_t = *mut c_void;

// It's an alias over "struct __kvm_t". However, its fields aren't supposed to be used directly,
// making the type definition system dependent. Better not bind it exactly.
pub type kvm_t = c_void;

pub type posix_spawnattr_t = *mut c_void;
pub type posix_spawn_file_actions_t = *mut c_void;

cfg_if! {
    if #[cfg(target_pointer_width = "64")] {
        type Elf_Addr = Elf64_Addr;
        type Elf_Half = Elf64_Half;
        type Elf_Phdr = Elf64_Phdr;
    } else if #[cfg(target_pointer_width = "32")] {
        type Elf_Addr = Elf32_Addr;
        type Elf_Half = Elf32_Half;
        type Elf_Phdr = Elf32_Phdr;
    }
}

// link.h

#[cfg_attr(feature = "extra_traits", derive(Debug))]
pub enum timezone {}
impl Copy for timezone {}
impl Clone for timezone {
    fn clone(&self) -> timezone {
        *self
    }
}

impl siginfo_t {
    pub unsafe fn si_addr(&self) -> *mut c_void {
        self.si_addr
    }

    pub unsafe fn si_value(&self) -> crate::sigval {
        self.si_value
    }

    pub unsafe fn si_pid(&self) -> crate::pid_t {
        self.si_pid
    }

    pub unsafe fn si_uid(&self) -> crate::uid_t {
        self.si_uid
    }

    pub unsafe fn si_status(&self) -> c_int {
        self.si_status
    }
}

s! {
    pub struct in_addr {
        pub s_addr: crate::in_addr_t,
    }

    pub struct ip_mreq {
        pub imr_multiaddr: in_addr,
        pub imr_interface: in_addr,
    }

    pub struct ip_mreqn {
        pub imr_multiaddr: in_addr,
        pub imr_address: in_addr,
        pub imr_ifindex: c_int,
    }

    pub struct ip_mreq_source {
        pub imr_multiaddr: in_addr,
        pub imr_sourceaddr: in_addr,
        pub imr_interface: in_addr,
    }

    pub struct glob_t {
        pub gl_pathc: size_t,
        pub gl_matchc: size_t,
        pub gl_offs: size_t,
        pub gl_flags: c_int,
        pub gl_pathv: *mut *mut c_char,
        __unused3: *mut c_void,
        __unused4: *mut c_void,
        __unused5: *mut c_void,
        __unused6: *mut c_void,
        __unused7: *mut c_void,
        __unused8: *mut c_void,
    }

    pub struct addrinfo {
        pub ai_flags: c_int,
        pub ai_family: c_int,
        pub ai_socktype: c_int,
        pub ai_protocol: c_int,
        pub ai_addrlen: crate::socklen_t,
        pub ai_canonname: *mut c_char,
        pub ai_addr: *mut crate::sockaddr,
        pub ai_next: *mut addrinfo,
    }

    pub struct sigset_t {
        bits: [u32; 4],
    }

    pub struct siginfo_t {
        pub si_signo: c_int,
        pub si_errno: c_int,
        pub si_code: c_int,
        pub si_pid: crate::pid_t,
        pub si_uid: crate::uid_t,
        pub si_status: c_int,
        pub si_addr: *mut c_void,
        pub si_value: crate::sigval,
        _pad1: c_long,
        _pad2: [c_int; 7],
    }

    pub struct sigaction {
        pub sa_sigaction: crate::sighandler_t,
        pub sa_flags: c_int,
        pub sa_mask: sigset_t,
    }

    pub struct sched_param {
        pub sched_priority: c_int,
    }

    pub struct Dl_info {
        pub dli_fname: *const c_char,
        pub dli_fbase: *mut c_void,
        pub dli_sname: *const c_char,
        pub dli_saddr: *mut c_void,
    }

    pub struct sockaddr_in {
        pub sin_len: u8,
        pub sin_family: crate::sa_family_t,
        pub sin_port: crate::in_port_t,
        pub sin_addr: crate::in_addr,
        pub sin_zero: [c_char; 8],
    }

    pub struct termios {
        pub c_iflag: crate::tcflag_t,
        pub c_oflag: crate::tcflag_t,
        pub c_cflag: crate::tcflag_t,
        pub c_lflag: crate::tcflag_t,
        pub c_cc: [crate::cc_t; crate::NCCS],
        pub c_ispeed: crate::speed_t,
        pub c_ospeed: crate::speed_t,
    }

    pub struct flock {
        pub l_start: off_t,
        pub l_len: off_t,
        pub l_pid: crate::pid_t,
        pub l_type: c_short,
        pub l_whence: c_short,
        #[cfg(not(target_os = "dragonfly"))]
        pub l_sysid: c_int,
    }

    pub struct sf_hdtr {
        pub headers: *mut crate::iovec,
        pub hdr_cnt: c_int,
        pub trailers: *mut crate::iovec,
        pub trl_cnt: c_int,
    }

    pub struct lconv {
        pub decimal_point: *mut c_char,
        pub thousands_sep: *mut c_char,
        pub grouping: *mut c_char,
        pub int_curr_symbol: *mut c_char,
        pub currency_symbol: *mut c_char,
        pub mon_decimal_point: *mut c_char,
        pub mon_thousands_sep: *mut c_char,
        pub mon_grouping: *mut c_char,
        pub positive_sign: *mut c_char,
        pub negative_sign: *mut c_char,
        pub int_frac_digits: c_char,
        pub frac_digits: c_char,
        pub p_cs_precedes: c_char,
        pub p_sep_by_space: c_char,
        pub n_cs_precedes: c_char,
        pub n_sep_by_space: c_char,
        pub p_sign_posn: c_char,
        pub n_sign_posn: c_char,
        pub int_p_cs_precedes: c_char,
        pub int_n_cs_precedes: c_char,
        pub int_p_sep_by_space: c_char,
        pub int_n_sep_by_space: c_char,
        pub int_p_sign_posn: c_char,
        pub int_n_sign_posn: c_char,
    }

    pub struct cmsgcred {
        pub cmcred_pid: crate::pid_t,
        pub cmcred_uid: crate::uid_t,
        pub cmcred_euid: crate::uid_t,
        pub cmcred_gid: crate::gid_t,
        pub cmcred_ngroups: c_short,
        pub cmcred_groups: [crate::gid_t; CMGROUP_MAX],
    }

    pub struct rtprio {
        pub type_: c_ushort,
        pub prio: c_ushort,
    }

    pub struct in6_pktinfo {
        pub ipi6_addr: crate::in6_addr,
        pub ipi6_ifindex: c_uint,
    }

    pub struct arphdr {
        pub ar_hrd: u16,
        pub ar_pro: u16,
        pub ar_hln: u8,
        pub ar_pln: u8,
        pub ar_op: u16,
    }

    pub struct timex {
        pub modes: c_uint,
        pub offset: c_long,
        pub freq: c_long,
        pub maxerror: c_long,
        pub esterror: c_long,
        pub status: c_int,
        pub constant: c_long,
        pub precision: c_long,
        pub tolerance: c_long,
        pub ppsfreq: c_long,
        pub jitter: c_long,
        pub shift: c_int,
        pub stabil: c_long,
        pub jitcnt: c_long,
        pub calcnt: c_long,
        pub errcnt: c_long,
        pub stbcnt: c_long,
    }

    pub struct ntptimeval {
        pub time: crate::timespec,
        pub maxerror: c_long,
        pub esterror: c_long,
        pub tai: c_long,
        pub time_state: c_int,
    }

    pub struct accept_filter_arg {
        pub af_name: [c_char; 16],
        af_arg: [c_char; 256 - 16],
    }

    pub struct ptrace_io_desc {
        pub piod_op: c_int,
        pub piod_offs: *mut c_void,
        pub piod_addr: *mut c_void,
        pub piod_len: size_t,
    }

    // bpf.h

    pub struct bpf_program {
        pub bf_len: c_uint,
        pub bf_insns: *mut bpf_insn,
    }

    pub struct bpf_stat {
        pub bs_recv: c_uint,
        pub bs_drop: c_uint,
    }

    pub struct bpf_version {
        pub bv_major: c_ushort,
        pub bv_minor: c_ushort,
    }

    pub struct bpf_hdr {
        pub bh_tstamp: crate::timeval,
        pub bh_caplen: u32,
        pub bh_datalen: u32,
        pub bh_hdrlen: c_ushort,
    }

    pub struct bpf_insn {
        pub code: c_ushort,
        pub jt: c_uchar,
        pub jf: c_uchar,
        pub k: u32,
    }

    pub struct bpf_dltlist {
        bfl_len: c_uint,
        bfl_list: *mut c_uint,
    }

    // elf.h

    pub struct Elf32_Phdr {
        pub p_type: Elf32_Word,
        pub p_offset: Elf32_Off,
        pub p_vaddr: Elf32_Addr,
        pub p_paddr: Elf32_Addr,
        pub p_filesz: Elf32_Word,
        pub p_memsz: Elf32_Word,
        pub p_flags: Elf32_Word,
        pub p_align: Elf32_Word,
    }

    pub struct Elf64_Phdr {
        pub p_type: Elf64_Word,
        pub p_flags: Elf64_Word,
        pub p_offset: Elf64_Off,
        pub p_vaddr: Elf64_Addr,
        pub p_paddr: Elf64_Addr,
        pub p_filesz: Elf64_Xword,
        pub p_memsz: Elf64_Xword,
        pub p_align: Elf64_Xword,
    }

    // link.h

    pub struct dl_phdr_info {
        pub dlpi_addr: Elf_Addr,
        pub dlpi_name: *const c_char,
        pub dlpi_phdr: *const Elf_Phdr,
        pub dlpi_phnum: Elf_Half,
        pub dlpi_adds: c_ulonglong,
        pub dlpi_subs: c_ulonglong,
        pub dlpi_tls_modid: usize,
        pub dlpi_tls_data: *mut c_void,
    }

    pub struct ipc_perm {
        pub cuid: crate::uid_t,
        pub cgid: crate::gid_t,
        pub uid: crate::uid_t,
        pub gid: crate::gid_t,
        pub mode: crate::mode_t,
        pub seq: c_ushort,
        pub key: crate::key_t,
    }

    pub struct eui64 {
        pub octet: [u8; EUI64_LEN],
    }
}

s_no_extra_traits! {
    pub struct sockaddr_storage {
        pub ss_len: u8,
        pub ss_family: crate::sa_family_t,
        __ss_pad1: [u8; 6],
        __ss_align: i64,
        __ss_pad2: [u8; 112],
    }
}

cfg_if! {
    if #[cfg(feature = "extra_traits")] {
        impl PartialEq for sockaddr_storage {
            fn eq(&self, other: &sockaddr_storage) -> bool {
                self.ss_len == other.ss_len
                    && self.ss_family == other.ss_family
                    && self.__ss_pad1 == other.__ss_pad1
                    && self.__ss_align == other.__ss_align
                    && self
                        .__ss_pad2
                        .iter()
                        .zip(other.__ss_pad2.iter())
                        .all(|(a, b)| a == b)
            }
        }
        impl Eq for sockaddr_storage {}
        impl fmt::Debug for sockaddr_storage {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.debug_struct("sockaddr_storage")
                    .field("ss_len", &self.ss_len)
                    .field("ss_family", &self.ss_family)
                    .field("__ss_pad1", &self.__ss_pad1)
                    .field("__ss_align", &self.__ss_align)
                    // FIXME(debug): .field("__ss_pad2", &self.__ss_pad2)
                    .finish()
            }
        }
        impl hash::Hash for sockaddr_storage {
            fn hash<H: hash::Hasher>(&self, state: &mut H) {
                self.ss_len.hash(state);
                self.ss_family.hash(state);
                self.__ss_pad1.hash(state);
                self.__ss_align.hash(state);
                self.__ss_pad2.hash(state);
            }
        }
    }
}

// Non-public helper constant
const SIZEOF_LONG: usize = mem::size_of::<c_long>();

#[deprecated(
    since = "0.2.64",
    note = "Can vary at runtime.  Use sysconf(3) instead"
)]
pub const AIO_LISTIO_MAX: c_int = 16;
pub const AIO_CANCELED: c_int = 1;
pub const AIO_NOTCANCELED: c_int = 2;
pub const AIO_ALLDONE: c_int = 3;
pub const LIO_NOP: c_int = 0;
pub const LIO_WRITE: c_int = 1;
pub const LIO_READ: c_int = 2;
pub const LIO_WAIT: c_int = 1;
pub const LIO_NOWAIT: c_int = 0;

pub const SIGEV_NONE: c_int = 0;
pub const SIGEV_SIGNAL: c_int = 1;
pub const SIGEV_THREAD: c_int = 2;
pub const SIGEV_KEVENT: c_int = 3;

pub const CODESET: crate::nl_item = 0;
pub const D_T_FMT: crate::nl_item = 1;
pub const D_FMT: crate::nl_item = 2;
pub const T_FMT: crate::nl_item = 3;
pub const T_FMT_AMPM: crate::nl_item = 4;
pub const AM_STR: crate::nl_item = 5;
pub const PM_STR: crate::nl_item = 6;

pub const DAY_1: crate::nl_item = 7;
pub const DAY_2: crate::nl_item = 8;
pub const DAY_3: crate::nl_item = 9;
pub const DAY_4: crate::nl_item = 10;
pub const DAY_5: crate::nl_item = 11;
pub const DAY_6: crate::nl_item = 12;
pub const DAY_7: crate::nl_item = 13;

pub const ABDAY_1: crate::nl_item = 14;
pub const ABDAY_2: crate::nl_item = 15;
pub const ABDAY_3: crate::nl_item = 16;
pub const ABDAY_4: crate::nl_item = 17;
pub const ABDAY_5: crate::nl_item = 18;
pub const ABDAY_6: crate::nl_item = 19;
pub const ABDAY_7: crate::nl_item = 20;

pub const MON_1: crate::nl_item = 21;
pub const MON_2: crate::nl_item = 22;
pub const MON_3: crate::nl_item = 23;
pub const MON_4: crate::nl_item = 24;
pub const MON_5: crate::nl_item = 25;
pub const MON_6: crate::nl_item = 26;
pub const MON_7: crate::nl_item = 27;
pub const MON_8: crate::nl_item = 28;
pub const MON_9: crate::nl_item = 29;
pub const MON_10: crate::nl_item = 30;
pub const MON_11: crate::nl_item = 31;
pub const MON_12: crate::nl_item = 32;

pub const ABMON_1: crate::nl_item = 33;
pub const ABMON_2: crate::nl_item = 34;
pub const ABMON_3: crate::nl_item = 35;
pub const ABMON_4: crate::nl_item = 36;
pub const ABMON_5: crate::nl_item = 37;
pub const ABMON_6: crate::nl_item = 38;
pub const ABMON_7: crate::nl_item = 39;
pub const ABMON_8: crate::nl_item = 40;
pub const ABMON_9: crate::nl_item = 41;
pub const ABMON_10: crate::nl_item = 42;
pub const ABMON_11: crate::nl_item = 43;
pub const ABMON_12: crate::nl_item = 44;

pub const ERA: crate::nl_item = 45;
pub const ERA_D_FMT: crate::nl_item = 46;
pub const ERA_D_T_FMT: crate::nl_item = 47;
pub const ERA_T_FMT: crate::nl_item = 48;
pub const ALT_DIGITS: crate::nl_item = 49;

pub const RADIXCHAR: crate::nl_item = 50;
pub const THOUSEP: crate::nl_item = 51;

pub const YESEXPR: crate::nl_item = 52;
pub const NOEXPR: crate::nl_item = 53;

pub const YESSTR: crate::nl_item = 54;
pub const NOSTR: crate::nl_item = 55;

pub const CRNCYSTR: crate::nl_item = 56;

pub const D_MD_ORDER: crate::nl_item = 57;

pub const ALTMON_1: crate::nl_item = 58;
pub const ALTMON_2: crate::nl_item = 59;
pub const ALTMON_3: crate::nl_item = 60;
pub const ALTMON_4: crate::nl_item = 61;
pub const ALTMON_5: crate::nl_item = 62;
pub const ALTMON_6: crate::nl_item = 63;
pub const ALTMON_7: crate::nl_item = 64;
pub const ALTMON_8: crate::nl_item = 65;
pub const ALTMON_9: crate::nl_item = 66;
pub const ALTMON_10: crate::nl_item = 67;
pub const ALTMON_11: crate::nl_item = 68;
pub const ALTMON_12: crate::nl_item = 69;

pub const EXIT_FAILURE: c_int = 1;
pub const EXIT_SUCCESS: c_int = 0;
pub const EOF: c_int = -1;
pub const SEEK_SET: c_int = 0;
pub const SEEK_CUR: c_int = 1;
pub const SEEK_END: c_int = 2;
pub const SEEK_DATA: c_int = 3;
pub const SEEK_HOLE: c_int = 4;
pub const _IOFBF: c_int = 0;
pub const _IONBF: c_int = 2;
pub const _IOLBF: c_int = 1;
pub const BUFSIZ: c_uint = 1024;
pub const FOPEN_MAX: c_uint = 20;
pub const FILENAME_MAX: c_uint = 1024;
pub const L_tmpnam: c_uint = 1024;
pub const TMP_MAX: c_uint = 308915776;

pub const O_NOCTTY: c_int = 32768;
pub const O_DIRECT: c_int = 0x00010000;

pub const S_IFIFO: mode_t = 0o1_0000;
pub const S_IFCHR: mode_t = 0o2_0000;
pub const S_IFBLK: mode_t = 0o6_0000;
pub const S_IFDIR: mode_t = 0o4_0000;
pub const S_IFREG: mode_t = 0o10_0000;
pub const S_IFLNK: mode_t = 0o12_0000;
pub const S_IFSOCK: mode_t = 0o14_0000;
pub const S_IFMT: mode_t = 0o17_0000;
pub const S_IEXEC: mode_t = 0o0100;
pub const S_IWRITE: mode_t = 0o0200;
pub const S_IREAD: mode_t = 0o0400;
pub const S_IRWXU: mode_t = 0o0700;
pub const S_IXUSR: mode_t = 0o0100;
pub const S_IWUSR: mode_t = 0o0200;
pub const S_IRUSR: mode_t = 0o0400;
pub const S_IRWXG: mode_t = 0o0070;
pub const S_IXGRP: mode_t = 0o0010;
pub const S_IWGRP: mode_t = 0o0020;
pub const S_IRGRP: mode_t = 0o0040;
pub const S_IRWXO: mode_t = 0o0007;
pub const S_IXOTH: mode_t = 0o0001;
pub const S_IWOTH: mode_t = 0o0002;
pub const S_IROTH: mode_t = 0o0004;
pub const F_OK: c_int = 0;
pub const R_OK: c_int = 4;
pub const W_OK: c_int = 2;
pub const X_OK: c_int = 1;
pub const STDIN_FILENO: c_int = 0;
pub const STDOUT_FILENO: c_int = 1;
pub const STDERR_FILENO: c_int = 2;
pub const F_LOCK: c_int = 1;
pub const F_TEST: c_int = 3;
pub const F_TLOCK: c_int = 2;
pub const F_ULOCK: c_int = 0;
pub const F_DUPFD_CLOEXEC: c_int = 17;
pub const F_DUP2FD: c_int = 10;
pub const F_DUP2FD_CLOEXEC: c_int = 18;
pub const SIGHUP: c_int = 1;
pub const SIGINT: c_int = 2;
pub const SIGQUIT: c_int = 3;
pub const SIGILL: c_int = 4;
pub const SIGABRT: c_int = 6;
pub const SIGEMT: c_int = 7;
pub const SIGFPE: c_int = 8;
pub const SIGKILL: c_int = 9;
pub const SIGSEGV: c_int = 11;
pub const SIGPIPE: c_int = 13;
pub const SIGALRM: c_int = 14;
pub const SIGTERM: c_int = 15;

pub const PROT_NONE: c_int = 0;
pub const PROT_READ: c_int = 1;
pub const PROT_WRITE: c_int = 2;
pub const PROT_EXEC: c_int = 4;

pub const MAP_FILE: c_int = 0x0000;
pub const MAP_SHARED: c_int = 0x0001;
pub const MAP_PRIVATE: c_int = 0x0002;
pub const MAP_FIXED: c_int = 0x0010;
pub const MAP_ANON: c_int = 0x1000;
pub const MAP_ANONYMOUS: c_int = MAP_ANON;

pub const MAP_FAILED: *mut c_void = !0 as *mut c_void;

pub const MCL_CURRENT: c_int = 0x0001;
pub const MCL_FUTURE: c_int = 0x0002;

pub const MNT_EXPUBLIC: c_int = 0x20000000;
pub const MNT_NOATIME: c_int = 0x10000000;
pub const MNT_NOCLUSTERR: c_int = 0x40000000;
pub const MNT_NOCLUSTERW: c_int = 0x80000000;
pub const MNT_NOSYMFOLLOW: c_int = 0x00400000;
pub const MNT_SOFTDEP: c_int = 0x00200000;
pub const MNT_SUIDDIR: c_int = 0x00100000;
pub const MNT_EXRDONLY: c_int = 0x00000080;
pub const MNT_DEFEXPORTED: c_int = 0x00000200;
pub const MNT_EXPORTANON: c_int = 0x00000400;
pub const MNT_EXKERB: c_int = 0x00000800;
pub const MNT_DELEXPORT: c_int = 0x00020000;

pub const MS_SYNC: c_int = 0x0000;
pub const MS_ASYNC: c_int = 0x0001;
pub const MS_INVALIDATE: c_int = 0x0002;

pub const EPERM: c_int = 1;
pub const ENOENT: c_int = 2;
pub const ESRCH: c_int = 3;
pub const EINTR: c_int = 4;
pub const EIO: c_int = 5;
pub const ENXIO: c_int = 6;
pub const E2BIG: c_int = 7;
pub const ENOEXEC: c_int = 8;
pub const EBADF: c_int = 9;
pub const ECHILD: c_int = 10;
pub const EDEADLK: c_int = 11;
pub const ENOMEM: c_int = 12;
pub const EACCES: c_int = 13;
pub const EFAULT: c_int = 14;
pub const ENOTBLK: c_int = 15;
pub const EBUSY: c_int = 16;
pub const EEXIST: c_int = 17;
pub const EXDEV: c_int = 18;
pub const ENODEV: c_int = 19;
pub const ENOTDIR: c_int = 20;
pub const EISDIR: c_int = 21;
pub const EINVAL: c_int = 22;
pub const ENFILE: c_int = 23;
pub const EMFILE: c_int = 24;
pub const ENOTTY: c_int = 25;
pub const ETXTBSY: c_int = 26;
pub const EFBIG: c_int = 27;
pub const ENOSPC: c_int = 28;
pub const ESPIPE: c_int = 29;
pub const EROFS: c_int = 30;
pub const EMLINK: c_int = 31;
pub const EPIPE: c_int = 32;
pub const EDOM: c_int = 33;
pub const ERANGE: c_int = 34;
pub const EAGAIN: c_int = 35;
pub const EWOULDBLOCK: c_int = 35;
pub const EINPROGRESS: c_int = 36;
pub const EALREADY: c_int = 37;
pub const ENOTSOCK: c_int = 38;
pub const EDESTADDRREQ: c_int = 39;
pub const EMSGSIZE: c_int = 40;
pub const EPROTOTYPE: c_int = 41;
pub const ENOPROTOOPT: c_int = 42;
pub const EPROTONOSUPPORT: c_int = 43;
pub const ESOCKTNOSUPPORT: c_int = 44;
pub const EOPNOTSUPP: c_int = 45;
pub const ENOTSUP: c_int = EOPNOTSUPP;
pub const EPFNOSUPPORT: c_int = 46;
pub const EAFNOSUPPORT: c_int = 47;
pub const EADDRINUSE: c_int = 48;
pub const EADDRNOTAVAIL: c_int = 49;
pub const ENETDOWN: c_int = 50;
pub const ENETUNREACH: c_int = 51;
pub const ENETRESET: c_int = 52;
pub const ECONNABORTED: c_int = 53;
pub const ECONNRESET: c_int = 54;
pub const ENOBUFS: c_int = 55;
pub const EISCONN: c_int = 56;
pub const ENOTCONN: c_int = 57;
pub const ESHUTDOWN: c_int = 58;
pub const ETOOMANYREFS: c_int = 59;
pub const ETIMEDOUT: c_int = 60;
pub const ECONNREFUSED: c_int = 61;
pub const ELOOP: c_int = 62;
pub const ENAMETOOLONG: c_int = 63;
pub const EHOSTDOWN: c_int = 64;
pub const EHOSTUNREACH: c_int = 65;
pub const ENOTEMPTY: c_int = 66;
pub const EPROCLIM: c_int = 67;
pub const EUSERS: c_int = 68;
pub const EDQUOT: c_int = 69;
pub const ESTALE: c_int = 70;
pub const EREMOTE: c_int = 71;
pub const EBADRPC: c_int = 72;
pub const ERPCMISMATCH: c_int = 73;
pub const EPROGUNAVAIL: c_int = 74;
pub const EPROGMISMATCH: c_int = 75;
pub const EPROCUNAVAIL: c_int = 76;
pub const ENOLCK: c_int = 77;
pub const ENOSYS: c_int = 78;
pub const EFTYPE: c_int = 79;
pub const EAUTH: c_int = 80;
pub const ENEEDAUTH: c_int = 81;
pub const EIDRM: c_int = 82;
pub const ENOMSG: c_int = 83;
pub const EOVERFLOW: c_int = 84;
pub const ECANCELED: c_int = 85;
pub const EILSEQ: c_int = 86;
pub const ENOATTR: c_int = 87;
pub const EDOOFUS: c_int = 88;
pub const EBADMSG: c_int = 89;
pub const EMULTIHOP: c_int = 90;
pub const ENOLINK: c_int = 91;
pub const EPROTO: c_int = 92;

pub const POLLSTANDARD: c_short = crate::POLLIN
    | crate::POLLPRI
    | crate::POLLOUT
    | crate::POLLRDNORM
    | crate::POLLRDBAND
    | crate::POLLWRBAND
    | crate::POLLERR
    | crate::POLLHUP
    | crate::POLLNVAL;

pub const AI_PASSIVE: c_int = 0x00000001;
pub const AI_CANONNAME: c_int = 0x00000002;
pub const AI_NUMERICHOST: c_int = 0x00000004;
pub const AI_NUMERICSERV: c_int = 0x00000008;
pub const AI_ALL: c_int = 0x00000100;
pub const AI_ADDRCONFIG: c_int = 0x00000400;
pub const AI_V4MAPPED: c_int = 0x00000800;

pub const EAI_AGAIN: c_int = 2;
pub const EAI_BADFLAGS: c_int = 3;
pub const EAI_FAIL: c_int = 4;
pub const EAI_FAMILY: c_int = 5;
pub const EAI_MEMORY: c_int = 6;
pub const EAI_NONAME: c_int = 8;
pub const EAI_SERVICE: c_int = 9;
pub const EAI_SOCKTYPE: c_int = 10;
pub const EAI_SYSTEM: c_int = 11;
pub const EAI_OVERFLOW: c_int = 14;

pub const F_DUPFD: c_int = 0;
pub const F_GETFD: c_int = 1;
pub const F_SETFD: c_int = 2;
pub const F_GETFL: c_int = 3;
pub const F_SETFL: c_int = 4;

pub const SIGTRAP: c_int = 5;

pub const GLOB_APPEND: c_int = 0x0001;
pub const GLOB_DOOFFS: c_int = 0x0002;
pub const GLOB_ERR: c_int = 0x0004;
pub const GLOB_MARK: c_int = 0x0008;
pub const GLOB_NOCHECK: c_int = 0x0010;
pub const GLOB_NOSORT: c_int = 0x0020;
pub const GLOB_NOESCAPE: c_int = 0x2000;

pub const GLOB_NOSPACE: c_int = -1;
pub const GLOB_ABORTED: c_int = -2;
pub const GLOB_NOMATCH: c_int = -3;

pub const POSIX_MADV_NORMAL: c_int = 0;
pub const POSIX_MADV_RANDOM: c_int = 1;
pub const POSIX_MADV_SEQUENTIAL: c_int = 2;
pub const POSIX_MADV_WILLNEED: c_int = 3;
pub const POSIX_MADV_DONTNEED: c_int = 4;

pub const PTHREAD_BARRIER_SERIAL_THREAD: c_int = -1;
pub const PTHREAD_PROCESS_PRIVATE: c_int = 0;
pub const PTHREAD_PROCESS_SHARED: c_int = 1;
pub const PTHREAD_CREATE_JOINABLE: c_int = 0;
pub const PTHREAD_CREATE_DETACHED: c_int = 1;

pub const RLIMIT_CPU: c_int = 0;
pub const RLIMIT_FSIZE: c_int = 1;
pub const RLIMIT_DATA: c_int = 2;
pub const RLIMIT_STACK: c_int = 3;
pub const RLIMIT_CORE: c_int = 4;
pub const RLIMIT_RSS: c_int = 5;
pub const RLIMIT_MEMLOCK: c_int = 6;
pub const RLIMIT_NPROC: c_int = 7;
pub const RLIMIT_NOFILE: c_int = 8;
pub const RLIMIT_SBSIZE: c_int = 9;
pub const RLIMIT_VMEM: c_int = 10;
pub const RLIMIT_AS: c_int = RLIMIT_VMEM;
pub const RLIM_INFINITY: rlim_t = 0x7fff_ffff_ffff_ffff;

pub const RUSAGE_SELF: c_int = 0;
pub const RUSAGE_CHILDREN: c_int = -1;

pub const CLOCK_REALTIME: crate::clockid_t = 0;
pub const CLOCK_VIRTUAL: crate::clockid_t = 1;
pub const CLOCK_PROF: crate::clockid_t = 2;
pub const CLOCK_MONOTONIC: crate::clockid_t = 4;
pub const CLOCK_UPTIME: crate::clockid_t = 5;
pub const CLOCK_UPTIME_PRECISE: crate::clockid_t = 7;
pub const CLOCK_UPTIME_FAST: crate::clockid_t = 8;
pub const CLOCK_REALTIME_PRECISE: crate::clockid_t = 9;
pub const CLOCK_REALTIME_FAST: crate::clockid_t = 10;
pub const CLOCK_MONOTONIC_PRECISE: crate::clockid_t = 11;
pub const CLOCK_MONOTONIC_FAST: crate::clockid_t = 12;
pub const CLOCK_SECOND: crate::clockid_t = 13;
pub const CLOCK_THREAD_CPUTIME_ID: crate::clockid_t = 14;
pub const CLOCK_PROCESS_CPUTIME_ID: crate::clockid_t = 15;

pub const MADV_NORMAL: c_int = 0;
pub const MADV_RANDOM: c_int = 1;
pub const MADV_SEQUENTIAL: c_int = 2;
pub const MADV_WILLNEED: c_int = 3;
pub const MADV_DONTNEED: c_int = 4;
pub const MADV_FREE: c_int = 5;
pub const MADV_NOSYNC: c_int = 6;
pub const MADV_AUTOSYNC: c_int = 7;
pub const MADV_NOCORE: c_int = 8;
pub const MADV_CORE: c_int = 9;

pub const MINCORE_INCORE: c_int = 0x1;
pub const MINCORE_REFERENCED: c_int = 0x2;
pub const MINCORE_MODIFIED: c_int = 0x4;
pub const MINCORE_REFERENCED_OTHER: c_int = 0x8;
pub const MINCORE_MODIFIED_OTHER: c_int = 0x10;

pub const AF_UNSPEC: c_int = 0;
pub const AF_LOCAL: c_int = 1;
pub const AF_UNIX: c_int = AF_LOCAL;
pub const AF_INET: c_int = 2;
pub const AF_IMPLINK: c_int = 3;
pub const AF_PUP: c_int = 4;
pub const AF_CHAOS: c_int = 5;
pub const AF_NETBIOS: c_int = 6;
pub const AF_ISO: c_int = 7;
pub const AF_OSI: c_int = AF_ISO;
pub const AF_ECMA: c_int = 8;
pub const AF_DATAKIT: c_int = 9;
pub const AF_CCITT: c_int = 10;
pub const AF_SNA: c_int = 11;
pub const AF_DECnet: c_int = 12;
pub const AF_DLI: c_int = 13;
pub const AF_LAT: c_int = 14;
pub const AF_HYLINK: c_int = 15;
pub const AF_APPLETALK: c_int = 16;
pub const AF_ROUTE: c_int = 17;
pub const AF_LINK: c_int = 18;
pub const pseudo_AF_XTP: c_int = 19;
pub const AF_COIP: c_int = 20;
pub const AF_CNT: c_int = 21;
pub const pseudo_AF_RTIP: c_int = 22;
pub const AF_IPX: c_int = 23;
pub const AF_SIP: c_int = 24;
pub const pseudo_AF_PIP: c_int = 25;
pub const AF_ISDN: c_int = 26;
pub const AF_E164: c_int = AF_ISDN;
pub const pseudo_AF_KEY: c_int = 27;
pub const AF_INET6: c_int = 28;
pub const AF_NATM: c_int = 29;
pub const AF_ATM: c_int = 30;
pub const pseudo_AF_HDRCMPLT: c_int = 31;
pub const AF_NETGRAPH: c_int = 32;

pub const PF_UNSPEC: c_int = AF_UNSPEC;
pub const PF_LOCAL: c_int = AF_LOCAL;
pub const PF_UNIX: c_int = PF_LOCAL;
pub const PF_INET: c_int = AF_INET;
pub const PF_IMPLINK: c_int = AF_IMPLINK;
pub const PF_PUP: c_int = AF_PUP;
pub const PF_CHAOS: c_int = AF_CHAOS;
pub const PF_NETBIOS: c_int = AF_NETBIOS;
pub const PF_ISO: c_int = AF_ISO;
pub const PF_OSI: c_int = AF_ISO;
pub const PF_ECMA: c_int = AF_ECMA;
pub const PF_DATAKIT: c_int = AF_DATAKIT;
pub const PF_CCITT: c_int = AF_CCITT;
pub const PF_SNA: c_int = AF_SNA;
pub const PF_DECnet: c_int = AF_DECnet;
pub const PF_DLI: c_int = AF_DLI;
pub const PF_LAT: c_int = AF_LAT;
pub const PF_HYLINK: c_int = AF_HYLINK;
pub const PF_APPLETALK: c_int = AF_APPLETALK;
pub const PF_ROUTE: c_int = AF_ROUTE;
pub const PF_LINK: c_int = AF_LINK;
pub const PF_XTP: c_int = pseudo_AF_XTP;
pub const PF_COIP: c_int = AF_COIP;
pub const PF_CNT: c_int = AF_CNT;
pub const PF_SIP: c_int = AF_SIP;
pub const PF_IPX: c_int = AF_IPX;
pub const PF_RTIP: c_int = pseudo_AF_RTIP;
pub const PF_PIP: c_int = pseudo_AF_PIP;
pub const PF_ISDN: c_int = AF_ISDN;
pub const PF_KEY: c_int = pseudo_AF_KEY;
pub const PF_INET6: c_int = AF_INET6;
pub const PF_NATM: c_int = AF_NATM;
pub const PF_ATM: c_int = AF_ATM;
pub const PF_NETGRAPH: c_int = AF_NETGRAPH;

pub const PIOD_READ_D: c_int = 1;
pub const PIOD_WRITE_D: c_int = 2;
pub const PIOD_READ_I: c_int = 3;
pub const PIOD_WRITE_I: c_int = 4;

pub const PT_TRACE_ME: c_int = 0;
pub const PT_READ_I: c_int = 1;
pub const PT_READ_D: c_int = 2;
pub const PT_WRITE_I: c_int = 4;
pub const PT_WRITE_D: c_int = 5;
pub const PT_CONTINUE: c_int = 7;
pub const PT_KILL: c_int = 8;
pub const PT_STEP: c_int = 9;
pub const PT_ATTACH: c_int = 10;
pub const PT_DETACH: c_int = 11;
pub const PT_IO: c_int = 12;

pub const SOMAXCONN: c_int = 128;

pub const MSG_OOB: c_int = 0x00000001;
pub const MSG_PEEK: c_int = 0x00000002;
pub const MSG_DONTROUTE: c_int = 0x00000004;
pub const MSG_EOR: c_int = 0x00000008;
pub const MSG_TRUNC: c_int = 0x00000010;
pub const MSG_CTRUNC: c_int = 0x00000020;
pub const MSG_WAITALL: c_int = 0x00000040;
pub const MSG_DONTWAIT: c_int = 0x00000080;
pub const MSG_EOF: c_int = 0x00000100;

pub const SCM_TIMESTAMP: c_int = 0x02;
pub const SCM_CREDS: c_int = 0x03;

pub const SOCK_STREAM: c_int = 1;
pub const SOCK_DGRAM: c_int = 2;
pub const SOCK_RAW: c_int = 3;
pub const SOCK_RDM: c_int = 4;
pub const SOCK_SEQPACKET: c_int = 5;
pub const SOCK_CLOEXEC: c_int = 0x10000000;
pub const SOCK_NONBLOCK: c_int = 0x20000000;
pub const SOCK_MAXADDRLEN: c_int = 255;
pub const IP_TTL: c_int = 4;
pub const IP_HDRINCL: c_int = 2;
pub const IP_RECVDSTADDR: c_int = 7;
pub const IP_SENDSRCADDR: c_int = IP_RECVDSTADDR;
pub const IP_ADD_MEMBERSHIP: c_int = 12;
pub const IP_DROP_MEMBERSHIP: c_int = 13;
pub const IP_RECVIF: c_int = 20;
pub const IP_RECVTTL: c_int = 65;
pub const IPV6_RECVHOPLIMIT: c_int = 37;
pub const IPV6_JOIN_GROUP: c_int = 12;
pub const IPV6_LEAVE_GROUP: c_int = 13;
pub const IPV6_CHECKSUM: c_int = 26;
pub const IPV6_RECVPKTINFO: c_int = 36;
pub const IPV6_PKTINFO: c_int = 46;
pub const IPV6_HOPLIMIT: c_int = 47;
pub const IPV6_RECVTCLASS: c_int = 57;
pub const IPV6_TCLASS: c_int = 61;
pub const IP_ADD_SOURCE_MEMBERSHIP: c_int = 70;
pub const IP_DROP_SOURCE_MEMBERSHIP: c_int = 71;
pub const IP_BLOCK_SOURCE: c_int = 72;
pub const IP_UNBLOCK_SOURCE: c_int = 73;

pub const TCP_NOPUSH: c_int = 4;
pub const TCP_NOOPT: c_int = 8;
pub const TCP_KEEPIDLE: c_int = 256;
pub const TCP_KEEPINTVL: c_int = 512;
pub const TCP_KEEPCNT: c_int = 1024;

pub const SOL_SOCKET: c_int = 0xffff;
pub const SO_DEBUG: c_int = 0x01;
pub const SO_ACCEPTCONN: c_int = 0x0002;
pub const SO_REUSEADDR: c_int = 0x0004;
pub const SO_KEEPALIVE: c_int = 0x0008;
pub const SO_DONTROUTE: c_int = 0x0010;
pub const SO_BROADCAST: c_int = 0x0020;
pub const SO_USELOOPBACK: c_int = 0x0040;
pub const SO_LINGER: c_int = 0x0080;
pub const SO_OOBINLINE: c_int = 0x0100;
pub const SO_REUSEPORT: c_int = 0x0200;
pub const SO_TIMESTAMP: c_int = 0x0400;
pub const SO_NOSIGPIPE: c_int = 0x0800;
pub const SO_ACCEPTFILTER: c_int = 0x1000;
pub const SO_SNDBUF: c_int = 0x1001;
pub const SO_RCVBUF: c_int = 0x1002;
pub const SO_SNDLOWAT: c_int = 0x1003;
pub const SO_RCVLOWAT: c_int = 0x1004;
pub const SO_SNDTIMEO: c_int = 0x1005;
pub const SO_RCVTIMEO: c_int = 0x1006;
pub const SO_ERROR: c_int = 0x1007;
pub const SO_TYPE: c_int = 0x1008;

pub const LOCAL_PEERCRED: c_int = 1;

// net/route.h
pub const RTF_XRESOLVE: c_int = 0x200;
pub const RTF_LLINFO: c_int = 0x400;
pub const RTF_PROTO3: c_int = 0x40000;
pub const RTF_PINNED: c_int = 0x100000;
pub const RTF_LOCAL: c_int = 0x200000;
pub const RTF_BROADCAST: c_int = 0x400000;
pub const RTF_MULTICAST: c_int = 0x800000;

pub const RTM_LOCK: c_int = 0x8;
pub const RTM_RESOLVE: c_int = 0xb;
pub const RTM_NEWADDR: c_int = 0xc;
pub const RTM_DELADDR: c_int = 0xd;
pub const RTM_IFINFO: c_int = 0xe;
pub const RTM_NEWMADDR: c_int = 0xf;
pub const RTM_DELMADDR: c_int = 0x10;
pub const RTM_IFANNOUNCE: c_int = 0x11;
pub const RTM_IEEE80211: c_int = 0x12;

pub const SHUT_RD: c_int = 0;
pub const SHUT_WR: c_int = 1;
pub const SHUT_RDWR: c_int = 2;

pub const LOCK_SH: c_int = 1;
pub const LOCK_EX: c_int = 2;
pub const LOCK_NB: c_int = 4;
pub const LOCK_UN: c_int = 8;

pub const MAP_COPY: c_int = 0x0002;
#[doc(hidden)]
#[deprecated(
    since = "0.2.54",
    note = "Removed in FreeBSD 11, unused in DragonFlyBSD"
)]
pub const MAP_RENAME: c_int = 0x0020;
#[doc(hidden)]
#[deprecated(
    since = "0.2.54",
    note = "Removed in FreeBSD 11, unused in DragonFlyBSD"
)]
pub const MAP_NORESERVE: c_int = 0x0040;
pub const MAP_HASSEMAPHORE: c_int = 0x0200;
pub const MAP_STACK: c_int = 0x0400;
pub const MAP_NOSYNC: c_int = 0x0800;
pub const MAP_NOCORE: c_int = 0x020000;

pub const IPPROTO_RAW: c_int = 255;

pub const _PC_LINK_MAX: c_int = 1;
pub const _PC_MAX_CANON: c_int = 2;
pub const _PC_MAX_INPUT: c_int = 3;
pub const _PC_NAME_MAX: c_int = 4;
pub const _PC_PATH_MAX: c_int = 5;
pub const _PC_PIPE_BUF: c_int = 6;
pub const _PC_CHOWN_RESTRICTED: c_int = 7;
pub const _PC_NO_TRUNC: c_int = 8;
pub const _PC_VDISABLE: c_int = 9;
pub const _PC_ALLOC_SIZE_MIN: c_int = 10;
pub const _PC_FILESIZEBITS: c_int = 12;
pub const _PC_REC_INCR_XFER_SIZE: c_int = 14;
pub const _PC_REC_MAX_XFER_SIZE: c_int = 15;
pub const _PC_REC_MIN_XFER_SIZE: c_int = 16;
pub const _PC_REC_XFER_ALIGN: c_int = 17;
pub const _PC_SYMLINK_MAX: c_int = 18;
pub const _PC_MIN_HOLE_SIZE: c_int = 21;
pub const _PC_ASYNC_IO: c_int = 53;
pub const _PC_PRIO_IO: c_int = 54;
pub const _PC_SYNC_IO: c_int = 55;
pub const _PC_ACL_EXTENDED: c_int = 59;
pub const _PC_ACL_PATH_MAX: c_int = 60;
pub const _PC_CAP_PRESENT: c_int = 61;
pub const _PC_INF_PRESENT: c_int = 62;
pub const _PC_MAC_PRESENT: c_int = 63;

pub const _SC_ARG_MAX: c_int = 1;
pub const _SC_CHILD_MAX: c_int = 2;
pub const _SC_CLK_TCK: c_int = 3;
pub const _SC_NGROUPS_MAX: c_int = 4;
pub const _SC_OPEN_MAX: c_int = 5;
pub const _SC_JOB_CONTROL: c_int = 6;
pub const _SC_SAVED_IDS: c_int = 7;
pub const _SC_VERSION: c_int = 8;
pub const _SC_BC_BASE_MAX: c_int = 9;
pub const _SC_BC_DIM_MAX: c_int = 10;
pub const _SC_BC_SCALE_MAX: c_int = 11;
pub const _SC_BC_STRING_MAX: c_int = 12;
pub const _SC_COLL_WEIGHTS_MAX: c_int = 13;
pub const _SC_EXPR_NEST_MAX: c_int = 14;
pub const _SC_LINE_MAX: c_int = 15;
pub const _SC_RE_DUP_MAX: c_int = 16;
pub const _SC_2_VERSION: c_int = 17;
pub const _SC_2_C_BIND: c_int = 18;
pub const _SC_2_C_DEV: c_int = 19;
pub const _SC_2_CHAR_TERM: c_int = 20;
pub const _SC_2_FORT_DEV: c_int = 21;
pub const _SC_2_FORT_RUN: c_int = 22;
pub const _SC_2_LOCALEDEF: c_int = 23;
pub const _SC_2_SW_DEV: c_int = 24;
pub const _SC_2_UPE: c_int = 25;
pub const _SC_STREAM_MAX: c_int = 26;
pub const _SC_TZNAME_MAX: c_int = 27;
pub const _SC_ASYNCHRONOUS_IO: c_int = 28;
pub const _SC_MAPPED_FILES: c_int = 29;
pub const _SC_MEMLOCK: c_int = 30;
pub const _SC_MEMLOCK_RANGE: c_int = 31;
pub const _SC_MEMORY_PROTECTION: c_int = 32;
pub const _SC_MESSAGE_PASSING: c_int = 33;
pub const _SC_PRIORITIZED_IO: c_int = 34;
pub const _SC_PRIORITY_SCHEDULING: c_int = 35;
pub const _SC_REALTIME_SIGNALS: c_int = 36;
pub const _SC_SEMAPHORES: c_int = 37;
pub const _SC_FSYNC: c_int = 38;
pub const _SC_SHARED_MEMORY_OBJECTS: c_int = 39;
pub const _SC_SYNCHRONIZED_IO: c_int = 40;
pub const _SC_TIMERS: c_int = 41;
pub const _SC_AIO_LISTIO_MAX: c_int = 42;
pub const _SC_AIO_MAX: c_int = 43;
pub const _SC_AIO_PRIO_DELTA_MAX: c_int = 44;
pub const _SC_DELAYTIMER_MAX: c_int = 45;
pub const _SC_MQ_OPEN_MAX: c_int = 46;
pub const _SC_PAGESIZE: c_int = 47;
pub const _SC_PAGE_SIZE: c_int = _SC_PAGESIZE;
pub const _SC_RTSIG_MAX: c_int = 48;
pub const _SC_SEM_NSEMS_MAX: c_int = 49;
pub const _SC_SEM_VALUE_MAX: c_int = 50;
pub const _SC_SIGQUEUE_MAX: c_int = 51;
pub const _SC_TIMER_MAX: c_int = 52;
pub const _SC_IOV_MAX: c_int = 56;
pub const _SC_NPROCESSORS_CONF: c_int = 57;
pub const _SC_2_PBS: c_int = 59;
pub const _SC_2_PBS_ACCOUNTING: c_int = 60;
pub const _SC_2_PBS_CHECKPOINT: c_int = 61;
pub const _SC_2_PBS_LOCATE: c_int = 62;
pub const _SC_2_PBS_MESSAGE: c_int = 63;
pub const _SC_2_PBS_TRACK: c_int = 64;
pub const _SC_ADVISORY_INFO: c_int = 65;
pub const _SC_BARRIERS: c_int = 66;
pub const _SC_CLOCK_SELECTION: c_int = 67;
pub const _SC_CPUTIME: c_int = 68;
pub const _SC_FILE_LOCKING: c_int = 69;
pub const _SC_NPROCESSORS_ONLN: c_int = 58;
pub const _SC_GETGR_R_SIZE_MAX: c_int = 70;
pub const _SC_GETPW_R_SIZE_MAX: c_int = 71;
pub const _SC_HOST_NAME_MAX: c_int = 72;
pub const _SC_LOGIN_NAME_MAX: c_int = 73;
pub const _SC_MONOTONIC_CLOCK: c_int = 74;
pub const _SC_MQ_PRIO_MAX: c_int = 75;
pub const _SC_READER_WRITER_LOCKS: c_int = 76;
pub const _SC_REGEXP: c_int = 77;
pub const _SC_SHELL: c_int = 78;
pub const _SC_SPAWN: c_int = 79;
pub const _SC_SPIN_LOCKS: c_int = 80;
pub const _SC_SPORADIC_SERVER: c_int = 81;
pub const _SC_THREAD_ATTR_STACKADDR: c_int = 82;
pub const _SC_THREAD_ATTR_STACKSIZE: c_int = 83;
pub const _SC_THREAD_DESTRUCTOR_ITERATIONS: c_int = 85;
pub const _SC_THREAD_KEYS_MAX: c_int = 86;
pub const _SC_THREAD_PRIO_INHERIT: c_int = 87;
pub const _SC_THREAD_PRIO_PROTECT: c_int = 88;
pub const _SC_THREAD_PRIORITY_SCHEDULING: c_int = 89;
pub const _SC_THREAD_PROCESS_SHARED: c_int = 90;
pub const _SC_THREAD_SAFE_FUNCTIONS: c_int = 91;
pub const _SC_THREAD_SPORADIC_SERVER: c_int = 92;
pub const _SC_THREAD_STACK_MIN: c_int = 93;
pub const _SC_THREAD_THREADS_MAX: c_int = 94;
pub const _SC_TIMEOUTS: c_int = 95;
pub const _SC_THREADS: c_int = 96;
pub const _SC_TRACE: c_int = 97;
pub const _SC_TRACE_EVENT_FILTER: c_int = 98;
pub const _SC_TRACE_INHERIT: c_int = 99;
pub const _SC_TRACE_LOG: c_int = 100;
pub const _SC_TTY_NAME_MAX: c_int = 101;
pub const _SC_TYPED_MEMORY_OBJECTS: c_int = 102;
pub const _SC_V6_ILP32_OFF32: c_int = 103;
pub const _SC_V6_ILP32_OFFBIG: c_int = 104;
pub const _SC_V6_LP64_OFF64: c_int = 105;
pub const _SC_V6_LPBIG_OFFBIG: c_int = 106;
pub const _SC_ATEXIT_MAX: c_int = 107;
pub const _SC_XOPEN_CRYPT: c_int = 108;
pub const _SC_XOPEN_ENH_I18N: c_int = 109;
pub const _SC_XOPEN_LEGACY: c_int = 110;
pub const _SC_XOPEN_REALTIME: c_int = 111;
pub const _SC_XOPEN_REALTIME_THREADS: c_int = 112;
pub const _SC_XOPEN_SHM: c_int = 113;
pub const _SC_XOPEN_STREAMS: c_int = 114;
pub const _SC_XOPEN_UNIX: c_int = 115;
pub const _SC_XOPEN_VERSION: c_int = 116;
pub const _SC_XOPEN_XCU_VERSION: c_int = 117;
pub const _SC_IPV6: c_int = 118;
pub const _SC_RAW_SOCKETS: c_int = 119;
pub const _SC_SYMLOOP_MAX: c_int = 120;
pub const _SC_PHYS_PAGES: c_int = 121;

pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = 0 as *mut _;
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = 0 as *mut _;
pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = 0 as *mut _;
pub const PTHREAD_MUTEX_ERRORCHECK: c_int = 1;
pub const PTHREAD_MUTEX_RECURSIVE: c_int = 2;
pub const PTHREAD_MUTEX_NORMAL: c_int = 3;
pub const PTHREAD_MUTEX_DEFAULT: c_int = PTHREAD_MUTEX_ERRORCHECK;

pub const SCHED_FIFO: c_int = 1;
pub const SCHED_OTHER: c_int = 2;
pub const SCHED_RR: c_int = 3;

pub const FD_SETSIZE: usize = 1024;

pub const ST_NOSUID: c_ulong = 2;

pub const NI_MAXHOST: size_t = 1025;

pub const XUCRED_VERSION: c_uint = 0;

pub const RTLD_LOCAL: c_int = 0;
pub const RTLD_NODELETE: c_int = 0x1000;
pub const RTLD_NOLOAD: c_int = 0x2000;
pub const RTLD_GLOBAL: c_int = 0x100;

pub const LOG_NTP: c_int = 12 << 3;
pub const LOG_SECURITY: c_int = 13 << 3;
pub const LOG_CONSOLE: c_int = 14 << 3;
pub const LOG_NFACILITIES: c_int = 24;

pub const TIOCEXCL: c_ulong = 0x2000740d;
pub const TIOCNXCL: c_ulong = 0x2000740e;
pub const TIOCFLUSH: c_ulong = 0x80047410;
pub const TIOCGETA: c_ulong = 0x402c7413;
pub const TIOCSETA: c_ulong = 0x802c7414;
pub const TIOCSETAW: c_ulong = 0x802c7415;
pub const TIOCSETAF: c_ulong = 0x802c7416;
pub const TIOCGETD: c_ulong = 0x4004741a;
pub const TIOCSETD: c_ulong = 0x8004741b;
pub const TIOCGDRAINWAIT: c_ulong = 0x40047456;
pub const TIOCSDRAINWAIT: c_ulong = 0x80047457;
pub const TIOCMGDTRWAIT: c_ulong = 0x4004745a;
pub const TIOCMSDTRWAIT: c_ulong = 0x8004745b;
pub const TIOCDRAIN: c_ulong = 0x2000745e;
pub const TIOCEXT: c_ulong = 0x80047460;
pub const TIOCSCTTY: c_ulong = 0x20007461;
pub const TIOCCONS: c_ulong = 0x80047462;
pub const TIOCGSID: c_ulong = 0x40047463;
pub const TIOCSTAT: c_ulong = 0x20007465;
pub const TIOCUCNTL: c_ulong = 0x80047466;
pub const TIOCSWINSZ: c_ulong = 0x80087467;
pub const TIOCGWINSZ: c_ulong = 0x40087468;
pub const TIOCMGET: c_ulong = 0x4004746a;
pub const TIOCM_LE: c_int = 0x1;
pub const TIOCM_DTR: c_int = 0x2;
pub const TIOCM_RTS: c_int = 0x4;
pub const TIOCM_ST: c_int = 0x8;
pub const TIOCM_SR: c_int = 0x10;
pub const TIOCM_CTS: c_int = 0x20;
pub const TIOCM_RI: c_int = 0x80;
pub const TIOCM_DSR: c_int = 0x100;
pub const TIOCM_CD: c_int = 0x40;
pub const TIOCM_CAR: c_int = 0x40;
pub const TIOCM_RNG: c_int = 0x80;
pub const TIOCMBIC: c_ulong = 0x8004746b;
pub const TIOCMBIS: c_ulong = 0x8004746c;
pub const TIOCMSET: c_ulong = 0x8004746d;
pub const TIOCSTART: c_ulong = 0x2000746e;
pub const TIOCSTOP: c_ulong = 0x2000746f;
pub const TIOCPKT: c_ulong = 0x80047470;
pub const TIOCPKT_DATA: c_int = 0x0;
pub const TIOCPKT_FLUSHREAD: c_int = 0x1;
pub const TIOCPKT_FLUSHWRITE: c_int = 0x2;
pub const TIOCPKT_STOP: c_int = 0x4;
pub const TIOCPKT_START: c_int = 0x8;
pub const TIOCPKT_NOSTOP: c_int = 0x10;
pub const TIOCPKT_DOSTOP: c_int = 0x20;
pub const TIOCPKT_IOCTL: c_int = 0x40;
pub const TIOCNOTTY: c_ulong = 0x20007471;
pub const TIOCSTI: c_ulong = 0x80017472;
pub const TIOCOUTQ: c_ulong = 0x40047473;
pub const TIOCSPGRP: c_ulong = 0x80047476;
pub const TIOCGPGRP: c_ulong = 0x40047477;
pub const TIOCCDTR: c_ulong = 0x20007478;
pub const TIOCSDTR: c_ulong = 0x20007479;
pub const TTYDISC: c_int = 0x0;
pub const SLIPDISC: c_int = 0x4;
pub const PPPDISC: c_int = 0x5;
pub const NETGRAPHDISC: c_int = 0x6;

pub const BIOCGRSIG: c_ulong = 0x40044272;
pub const BIOCSRSIG: c_ulong = 0x80044273;
pub const BIOCSDLT: c_ulong = 0x80044278;
pub const BIOCGSEESENT: c_ulong = 0x40044276;
pub const BIOCSSEESENT: c_ulong = 0x80044277;
cfg_if! {
    if #[cfg(target_pointer_width = "64")] {
        pub const BIOCGDLTLIST: c_ulong = 0xc0104279;
        pub const BIOCSETF: c_ulong = 0x80104267;
    } else if #[cfg(target_pointer_width = "32")] {
        pub const BIOCGDLTLIST: c_ulong = 0xc0084279;
        pub const BIOCSETF: c_ulong = 0x80084267;
    }
}

pub const FIODTYPE: c_ulong = 0x4004667a;
pub const FIOGETLBA: c_ulong = 0x40046679;

pub const B0: speed_t = 0;
pub const B50: speed_t = 50;
pub const B75: speed_t = 75;
pub const B110: speed_t = 110;
pub const B134: speed_t = 134;
pub const B150: speed_t = 150;
pub const B200: speed_t = 200;
pub const B300: speed_t = 300;
pub const B600: speed_t = 600;
pub const B1200: speed_t = 1200;
pub const B1800: speed_t = 1800;
pub const B2400: speed_t = 2400;
pub const B4800: speed_t = 4800;
pub const B9600: speed_t = 9600;
pub const B19200: speed_t = 19200;
pub const B38400: speed_t = 38400;
pub const B7200: speed_t = 7200;
pub const B14400: speed_t = 14400;
pub const B28800: speed_t = 28800;
pub const B57600: speed_t = 57600;
pub const B76800: speed_t = 76800;
pub const B115200: speed_t = 115200;
pub const B230400: speed_t = 230400;
pub const EXTA: speed_t = 19200;
pub const EXTB: speed_t = 38400;

pub const SEM_FAILED: *mut sem_t = 0 as *mut sem_t;

pub const CRTSCTS: crate::tcflag_t = 0x00030000;
pub const CCTS_OFLOW: crate::tcflag_t = 0x00010000;
pub const CRTS_IFLOW: crate::tcflag_t = 0x00020000;
pub const CDTR_IFLOW: crate::tcflag_t = 0x00040000;
pub const CDSR_OFLOW: crate::tcflag_t = 0x00080000;
pub const CCAR_OFLOW: crate::tcflag_t = 0x00100000;
pub const VERASE2: usize = 7;
pub const OCRNL: crate::tcflag_t = 0x10;
pub const ONOCR: crate::tcflag_t = 0x20;
pub const ONLRET: crate::tcflag_t = 0x40;

pub const CMGROUP_MAX: usize = 16;

pub const EUI64_LEN: usize = 8;

// https://github.com/freebsd/freebsd/blob/HEAD/sys/net/bpf.h
pub const BPF_ALIGNMENT: usize = SIZEOF_LONG;

// Values for rtprio struct (prio field) and syscall (function argument)
pub const RTP_PRIO_MIN: c_ushort = 0;
pub const RTP_PRIO_MAX: c_ushort = 31;
pub const RTP_LOOKUP: c_int = 0;
pub const RTP_SET: c_int = 1;

// Flags for chflags(2)
pub const UF_SETTABLE: c_ulong = 0x0000ffff;
pub const UF_NODUMP: c_ulong = 0x00000001;
pub const UF_IMMUTABLE: c_ulong = 0x00000002;
pub const UF_APPEND: c_ulong = 0x00000004;
pub const UF_OPAQUE: c_ulong = 0x00000008;
pub const UF_NOUNLINK: c_ulong = 0x00000010;
pub const SF_SETTABLE: c_ulong = 0xffff0000;
pub const SF_ARCHIVED: c_ulong = 0x00010000;
pub const SF_IMMUTABLE: c_ulong = 0x00020000;
pub const SF_APPEND: c_ulong = 0x00040000;
pub const SF_NOUNLINK: c_ulong = 0x00100000;

pub const TIMER_ABSTIME: c_int = 1;

//<sys/timex.h>
pub const NTP_API: c_int = 4;
pub const MAXPHASE: c_long = 500000000;
pub const MAXFREQ: c_long = 500000;
pub const MINSEC: c_int = 256;
pub const MAXSEC: c_int = 2048;
pub const NANOSECOND: c_long = 1000000000;
pub const SCALE_PPM: c_int = 65;
pub const MAXTC: c_int = 10;
pub const MOD_OFFSET: c_uint = 0x0001;
pub const MOD_FREQUENCY: c_uint = 0x0002;
pub const MOD_MAXERROR: c_uint = 0x0004;
pub const MOD_ESTERROR: c_uint = 0x0008;
pub const MOD_STATUS: c_uint = 0x0010;
pub const MOD_TIMECONST: c_uint = 0x0020;
pub const MOD_PPSMAX: c_uint = 0x0040;
pub const MOD_TAI: c_uint = 0x0080;
pub const MOD_MICRO: c_uint = 0x1000;
pub const MOD_NANO: c_uint = 0x2000;
pub const MOD_CLKB: c_uint = 0x4000;
pub const MOD_CLKA: c_uint = 0x8000;
pub const STA_PLL: c_int = 0x0001;
pub const STA_PPSFREQ: c_int = 0x0002;
pub const STA_PPSTIME: c_int = 0x0004;
pub const STA_FLL: c_int = 0x0008;
pub const STA_INS: c_int = 0x0010;
pub const STA_DEL: c_int = 0x0020;
pub const STA_UNSYNC: c_int = 0x0040;
pub const STA_FREQHOLD: c_int = 0x0080;
pub const STA_PPSSIGNAL: c_int = 0x0100;
pub const STA_PPSJITTER: c_int = 0x0200;
pub const STA_PPSWANDER: c_int = 0x0400;
pub const STA_PPSERROR: c_int = 0x0800;
pub const STA_CLOCKERR: c_int = 0x1000;
pub const STA_NANO: c_int = 0x2000;
pub const STA_MODE: c_int = 0x4000;
pub const STA_CLK: c_int = 0x8000;
pub const STA_RONLY: c_int = STA_PPSSIGNAL
    | STA_PPSJITTER
    | STA_PPSWANDER
    | STA_PPSERROR
    | STA_CLOCKERR
    | STA_NANO
    | STA_MODE
    | STA_CLK;
pub const TIME_OK: c_int = 0;
pub const TIME_INS: c_int = 1;
pub const TIME_DEL: c_int = 2;
pub const TIME_OOP: c_int = 3;
pub const TIME_WAIT: c_int = 4;
pub const TIME_ERROR: c_int = 5;

pub const REG_ENOSYS: c_int = -1;
pub const REG_ILLSEQ: c_int = 17;

pub const IPC_PRIVATE: crate::key_t = 0;
pub const IPC_CREAT: c_int = 0o1000;
pub const IPC_EXCL: c_int = 0o2000;
pub const IPC_NOWAIT: c_int = 0o4000;
pub const IPC_RMID: c_int = 0;
pub const IPC_SET: c_int = 1;
pub const IPC_STAT: c_int = 2;
pub const IPC_R: c_int = 0o400;
pub const IPC_W: c_int = 0o200;
pub const IPC_M: c_int = 0o10000;

pub const SHM_RDONLY: c_int = 0o10000;
pub const SHM_RND: c_int = 0o20000;
pub const SHM_R: c_int = 0o400;
pub const SHM_W: c_int = 0o200;

pub const KENV_GET: c_int = 0;
pub const KENV_SET: c_int = 1;
pub const KENV_UNSET: c_int = 2;
pub const KENV_DUMP: c_int = 3;
pub const KENV_MNAMELEN: c_int = 128;
pub const KENV_MVALLEN: c_int = 128;

pub const RB_ASKNAME: c_int = 0x001;
pub const RB_SINGLE: c_int = 0x002;
pub const RB_NOSYNC: c_int = 0x004;
pub const RB_HALT: c_int = 0x008;
pub const RB_INITNAME: c_int = 0x010;
pub const RB_DFLTROOT: c_int = 0x020;
pub const RB_KDB: c_int = 0x040;
pub const RB_RDONLY: c_int = 0x080;
pub const RB_DUMP: c_int = 0x100;
pub const RB_MINIROOT: c_int = 0x200;
pub const RB_VERBOSE: c_int = 0x800;
pub const RB_SERIAL: c_int = 0x1000;
pub const RB_CDROM: c_int = 0x2000;
pub const RB_POWEROFF: c_int = 0x4000;
pub const RB_GDB: c_int = 0x8000;
pub const RB_MUTE: c_int = 0x10000;
pub const RB_SELFTEST: c_int = 0x20000;

// For getrandom()
pub const GRND_NONBLOCK: c_uint = 0x1;
pub const GRND_RANDOM: c_uint = 0x2;
pub const GRND_INSECURE: c_uint = 0x4;

// DIFF(main): changed to `c_short` in f62eb023ab
pub const POSIX_SPAWN_RESETIDS: c_int = 0x01;
pub const POSIX_SPAWN_SETPGROUP: c_int = 0x02;
pub const POSIX_SPAWN_SETSCHEDPARAM: c_int = 0x04;
pub const POSIX_SPAWN_SETSCHEDULER: c_int = 0x08;
pub const POSIX_SPAWN_SETSIGDEF: c_int = 0x10;
pub const POSIX_SPAWN_SETSIGMASK: c_int = 0x20;

safe_f! {
    pub {const} fn WIFCONTINUED(status: c_int) -> bool {
        status == 0x13
    }

    pub {const} fn WSTOPSIG(status: c_int) -> c_int {
        status >> 8
    }

    pub {const} fn WIFSTOPPED(status: c_int) -> bool {
        (status & 0o177) == 0o177
    }
}

extern "C" {
    pub fn sem_destroy(sem: *mut sem_t) -> c_int;
    pub fn sem_init(sem: *mut sem_t, pshared: c_int, value: c_uint) -> c_int;

    pub fn daemon(nochdir: c_int, noclose: c_int) -> c_int;
    pub fn gettimeofday(tp: *mut crate::timeval, tz: *mut crate::timezone) -> c_int;
    pub fn accept4(
        s: c_int,
        addr: *mut crate::sockaddr,
        addrlen: *mut crate::socklen_t,
        flags: c_int,
    ) -> c_int;
    pub fn chflags(path: *const c_char, flags: c_ulong) -> c_int;
    pub fn chflagsat(fd: c_int, path: *const c_char, flags: c_ulong, atflag: c_int) -> c_int;

    pub fn clock_nanosleep(
        clk_id: crate::clockid_t,
        flags: c_int,
        rqtp: *const crate::timespec,
        rmtp: *mut crate::timespec,
    ) -> c_int;

    pub fn clock_getres(clk_id: crate::clockid_t, tp: *mut crate::timespec) -> c_int;
    pub fn clock_gettime(clk_id: crate::clockid_t, tp: *mut crate::timespec) -> c_int;
    pub fn clock_settime(clk_id: crate::clockid_t, tp: *const crate::timespec) -> c_int;
    pub fn clock_getcpuclockid(pid: crate::pid_t, clk_id: *mut crate::clockid_t) -> c_int;

    pub fn pthread_getcpuclockid(thread: crate::pthread_t, clk_id: *mut crate::clockid_t) -> c_int;

    pub fn dirfd(dirp: *mut crate::DIR) -> c_int;
    pub fn duplocale(base: crate::locale_t) -> crate::locale_t;
    pub fn endutxent();
    pub fn fchflags(fd: c_int, flags: c_ulong) -> c_int;

    // DIFF(main): changed to `*const *mut` in e77f551de9
    pub fn fexecve(fd: c_int, argv: *const *const c_char, envp: *const *const c_char) -> c_int;

    pub fn futimens(fd: c_int, times: *const crate::timespec) -> c_int;
    pub fn getdomainname(name: *mut c_char, len: c_int) -> c_int;
    pub fn getgrent_r(
        grp: *mut crate::group,
        buf: *mut c_char,
        buflen: size_t,
        result: *mut *mut crate::group,
    ) -> c_int;
    pub fn getpwent_r(
        pwd: *mut crate::passwd,
        buf: *mut c_char,
        buflen: size_t,
        result: *mut *mut crate::passwd,
    ) -> c_int;
    pub fn getgrouplist(
        name: *const c_char,
        basegid: crate::gid_t,
        groups: *mut crate::gid_t,
        ngroups: *mut c_int,
    ) -> c_int;
    pub fn getnameinfo(
        sa: *const crate::sockaddr,
        salen: crate::socklen_t,
        host: *mut c_char,
        hostlen: size_t,
        serv: *mut c_char,
        servlen: size_t,
        flags: c_int,
    ) -> c_int;
    pub fn getpriority(which: c_int, who: c_int) -> c_int;
    pub fn getresgid(
        rgid: *mut crate::gid_t,
        egid: *mut crate::gid_t,
        sgid: *mut crate::gid_t,
    ) -> c_int;
    pub fn getresuid(
        ruid: *mut crate::uid_t,
        euid: *mut crate::uid_t,
        suid: *mut crate::uid_t,
    ) -> c_int;
    pub fn getutxent() -> *mut utmpx;
    pub fn getutxid(ut: *const utmpx) -> *mut utmpx;
    pub fn getutxline(ut: *const utmpx) -> *mut utmpx;
    pub fn initgroups(name: *const c_char, basegid: crate::gid_t) -> c_int;
    #[cfg_attr(
        all(target_os = "freebsd", any(freebsd11, freebsd10)),
        link_name = "kevent@FBSD_1.0"
    )]
    pub fn kevent(
        kq: c_int,
        changelist: *const crate::kevent,
        nchanges: c_int,
        eventlist: *mut crate::kevent,
        nevents: c_int,
        timeout: *const crate::timespec,
    ) -> c_int;
    pub fn lchflags(path: *const c_char, flags: c_ulong) -> c_int;
    pub fn lutimes(file: *const c_char, times: *const crate::timeval) -> c_int;
    pub fn memrchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
    pub fn mkfifoat(dirfd: c_int, pathname: *const c_char, mode: crate::mode_t) -> c_int;
    #[cfg_attr(
        all(target_os = "freebsd", any(freebsd11, freebsd10)),
        link_name = "mknodat@FBSD_1.1"
    )]
    pub fn mknodat(dirfd: c_int, pathname: *const c_char, mode: crate::mode_t, dev: dev_t)
        -> c_int;
    pub fn malloc_usable_size(ptr: *const c_void) -> size_t;
    pub fn mincore(addr: *const c_void, len: size_t, vec: *mut c_char) -> c_int;
    pub fn newlocale(mask: c_int, locale: *const c_char, base: crate::locale_t) -> crate::locale_t;
    pub fn nl_langinfo_l(item: crate::nl_item, locale: crate::locale_t) -> *mut c_char;
    pub fn pipe2(fds: *mut c_int, flags: c_int) -> c_int;
    pub fn posix_fallocate(fd: c_int, offset: off_t, len: off_t) -> c_int;
    pub fn posix_fadvise(fd: c_int, offset: off_t, len: off_t, advise: c_int) -> c_int;
    pub fn ppoll(
        fds: *mut crate::pollfd,
        nfds: crate::nfds_t,
        timeout: *const crate::timespec,
        sigmask: *const sigset_t,
    ) -> c_int;
    pub fn preadv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;
    pub fn pthread_attr_get_np(tid: crate::pthread_t, attr: *mut crate::pthread_attr_t) -> c_int;
    pub fn pthread_attr_getguardsize(
        attr: *const crate::pthread_attr_t,
        guardsize: *mut size_t,
    ) -> c_int;
    pub fn pthread_attr_setguardsize(attr: *mut crate::pthread_attr_t, guardsize: size_t) -> c_int;
    pub fn pthread_attr_getstack(
        attr: *const crate::pthread_attr_t,
        stackaddr: *mut *mut c_void,
        stacksize: *mut size_t,
    ) -> c_int;
    pub fn pthread_condattr_getclock(
        attr: *const pthread_condattr_t,
        clock_id: *mut clockid_t,
    ) -> c_int;
    pub fn pthread_condattr_getpshared(
        attr: *const pthread_condattr_t,
        pshared: *mut c_int,
    ) -> c_int;
    pub fn pthread_condattr_setclock(
        attr: *mut pthread_condattr_t,
        clock_id: crate::clockid_t,
    ) -> c_int;
    pub fn pthread_condattr_setpshared(attr: *mut pthread_condattr_t, pshared: c_int) -> c_int;
    pub fn pthread_main_np() -> c_int;
    pub fn pthread_mutex_timedlock(
        lock: *mut pthread_mutex_t,
        abstime: *const crate::timespec,
    ) -> c_int;
    pub fn pthread_mutexattr_getpshared(
        attr: *const pthread_mutexattr_t,
        pshared: *mut c_int,
    ) -> c_int;
    pub fn pthread_mutexattr_setpshared(attr: *mut pthread_mutexattr_t, pshared: c_int) -> c_int;
    pub fn pthread_rwlockattr_getpshared(
        attr: *const pthread_rwlockattr_t,
        val: *mut c_int,
    ) -> c_int;
    pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t, val: c_int) -> c_int;
    pub fn pthread_barrierattr_init(attr: *mut crate::pthread_barrierattr_t) -> c_int;
    pub fn pthread_barrierattr_destroy(attr: *mut crate::pthread_barrierattr_t) -> c_int;
    pub fn pthread_barrierattr_getpshared(
        attr: *const crate::pthread_barrierattr_t,
        shared: *mut c_int,
    ) -> c_int;
    pub fn pthread_barrierattr_setpshared(
        attr: *mut crate::pthread_barrierattr_t,
        shared: c_int,
    ) -> c_int;
    pub fn pthread_barrier_init(
        barrier: *mut pthread_barrier_t,
        attr: *const crate::pthread_barrierattr_t,
        count: c_uint,
    ) -> c_int;
    pub fn pthread_barrier_destroy(barrier: *mut pthread_barrier_t) -> c_int;
    pub fn pthread_barrier_wait(barrier: *mut pthread_barrier_t) -> c_int;
    pub fn pthread_get_name_np(tid: crate::pthread_t, name: *mut c_char, len: size_t);
    pub fn pthread_set_name_np(tid: crate::pthread_t, name: *const c_char);
    pub fn pthread_getname_np(
        thread: crate::pthread_t,
        buffer: *mut c_char,
        length: size_t,
    ) -> c_int;
    pub fn pthread_setname_np(thread: crate::pthread_t, name: *const c_char) -> c_int;
    pub fn pthread_setschedparam(
        native: crate::pthread_t,
        policy: c_int,
        param: *const sched_param,
    ) -> c_int;
    pub fn pthread_getschedparam(
        native: crate::pthread_t,
        policy: *mut c_int,
        param: *mut sched_param,
    ) -> c_int;
    pub fn ptrace(request: c_int, pid: crate::pid_t, addr: *mut c_char, data: c_int) -> c_int;
    pub fn utrace(addr: *const c_void, len: size_t) -> c_int;
    pub fn pututxline(ut: *const utmpx) -> *mut utmpx;
    pub fn pwritev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;
    pub fn querylocale(mask: c_int, loc: crate::locale_t) -> *const c_char;
    pub fn rtprio(function: c_int, pid: crate::pid_t, rtp: *mut rtprio) -> c_int;
    pub fn sched_rr_get_interval(pid: crate::pid_t, t: *mut crate::timespec) -> c_int;
    pub fn sched_getparam(pid: crate::pid_t, param: *mut sched_param) -> c_int;
    pub fn sched_setparam(pid: crate::pid_t, param: *const sched_param) -> c_int;
    pub fn sched_getscheduler(pid: crate::pid_t) -> c_int;
    pub fn sched_setscheduler(
        pid: crate::pid_t,
        policy: c_int,
        param: *const crate::sched_param,
    ) -> c_int;
    pub fn sem_getvalue(sem: *mut sem_t, sval: *mut c_int) -> c_int;
    pub fn sem_timedwait(sem: *mut sem_t, abstime: *const crate::timespec) -> c_int;
    pub fn sendfile(
        fd: c_int,
        s: c_int,
        offset: off_t,
        nbytes: size_t,
        hdtr: *mut crate::sf_hdtr,
        sbytes: *mut off_t,
        flags: c_int,
    ) -> c_int;
    pub fn setdomainname(name: *const c_char, len: c_int) -> c_int;
    pub fn sethostname(name: *const c_char, len: c_int) -> c_int;
    pub fn setpriority(which: c_int, who: c_int, prio: c_int) -> c_int;
    pub fn setresgid(rgid: crate::gid_t, egid: crate::gid_t, sgid: crate::gid_t) -> c_int;
    pub fn setresuid(ruid: crate::uid_t, euid: crate::uid_t, suid: crate::uid_t) -> c_int;
    pub fn settimeofday(tv: *const crate::timeval, tz: *const crate::timezone) -> c_int;
    pub fn setutxent();
    pub fn shm_open(name: *const c_char, oflag: c_int, mode: crate::mode_t) -> c_int;
    pub fn sigtimedwait(
        set: *const sigset_t,
        info: *mut siginfo_t,
        timeout: *const crate::timespec,
    ) -> c_int;
    pub fn sigwaitinfo(set: *const sigset_t, info: *mut siginfo_t) -> c_int;
    pub fn sysctl(
        name: *const c_int,
        namelen: c_uint,
        oldp: *mut c_void,
        oldlenp: *mut size_t,
        newp: *const c_void,
        newlen: size_t,
    ) -> c_int;
    pub fn sysctlbyname(
        name: *const c_char,
        oldp: *mut c_void,
        oldlenp: *mut size_t,
        newp: *const c_void,
        newlen: size_t,
    ) -> c_int;
    pub fn sysctlnametomib(name: *const c_char, mibp: *mut c_int, sizep: *mut size_t) -> c_int;
    pub fn uselocale(loc: crate::locale_t) -> crate::locale_t;
    pub fn utimensat(
        dirfd: c_int,
        path: *const c_char,
        times: *const crate::timespec,
        flag: c_int,
    ) -> c_int;

    pub fn ntp_adjtime(buf: *mut timex) -> c_int;
    pub fn ntp_gettime(buf: *mut ntptimeval) -> c_int;

    // #include <link.h>
    pub fn dl_iterate_phdr(
        callback: Option<
            unsafe extern "C" fn(info: *mut dl_phdr_info, size: usize, data: *mut c_void) -> c_int,
        >,
        data: *mut c_void,
    ) -> c_int;

    pub fn iconv_open(tocode: *const c_char, fromcode: *const c_char) -> iconv_t;
    pub fn iconv(
        cd: iconv_t,
        inbuf: *mut *mut c_char,
        inbytesleft: *mut size_t,
        outbuf: *mut *mut c_char,
        outbytesleft: *mut size_t,
    ) -> size_t;
    pub fn iconv_close(cd: iconv_t) -> c_int;

    // Added in `FreeBSD` 11.0
    // Added in `DragonFly BSD` 5.4
    pub fn explicit_bzero(s: *mut c_void, len: size_t);
    // ISO/IEC 9899:2011 ("ISO C11") K.3.7.4.1
    pub fn memset_s(s: *mut c_void, smax: size_t, c: c_int, n: size_t) -> c_int;
    pub fn gethostid() -> c_long;
    pub fn sethostid(hostid: c_long);

    pub fn eui64_aton(a: *const c_char, e: *mut eui64) -> c_int;
    pub fn eui64_ntoa(id: *const eui64, a: *mut c_char, len: size_t) -> c_int;
    pub fn eui64_ntohost(hostname: *mut c_char, len: size_t, id: *const eui64) -> c_int;
    pub fn eui64_hostton(hostname: *const c_char, id: *mut eui64) -> c_int;

    pub fn eaccess(path: *const c_char, mode: c_int) -> c_int;

    pub fn kenv(action: c_int, name: *const c_char, value: *mut c_char, len: c_int) -> c_int;
    pub fn reboot(howto: c_int) -> c_int;

    pub fn exect(path: *const c_char, argv: *const *mut c_char, envp: *const *mut c_char) -> c_int;
    pub fn execvP(
        file: *const c_char,
        search_path: *const c_char,
        argv: *const *mut c_char,
    ) -> c_int;

    pub fn mkostemp(template: *mut c_char, flags: c_int) -> c_int;
    pub fn mkostemps(template: *mut c_char, suffixlen: c_int, flags: c_int) -> c_int;

    pub fn posix_spawn(
        pid: *mut crate::pid_t,
        path: *const c_char,
        file_actions: *const crate::posix_spawn_file_actions_t,
        attrp: *const crate::posix_spawnattr_t,
        argv: *const *mut c_char,
        envp: *const *mut c_char,
    ) -> c_int;
    pub fn posix_spawnp(
        pid: *mut crate::pid_t,
        file: *const c_char,
        file_actions: *const crate::posix_spawn_file_actions_t,
        attrp: *const crate::posix_spawnattr_t,
        argv: *const *mut c_char,
        envp: *const *mut c_char,
    ) -> c_int;
    pub fn posix_spawnattr_init(attr: *mut posix_spawnattr_t) -> c_int;
    pub fn posix_spawnattr_destroy(attr: *mut posix_spawnattr_t) -> c_int;
    pub fn posix_spawnattr_getsigdefault(
        attr: *const posix_spawnattr_t,
        default: *mut crate::sigset_t,
    ) -> c_int;
    pub fn posix_spawnattr_setsigdefault(
        attr: *mut posix_spawnattr_t,
        default: *const crate::sigset_t,
    ) -> c_int;
    pub fn posix_spawnattr_getsigmask(
        attr: *const posix_spawnattr_t,
        default: *mut crate::sigset_t,
    ) -> c_int;
    pub fn posix_spawnattr_setsigmask(
        attr: *mut posix_spawnattr_t,
        default: *const crate::sigset_t,
    ) -> c_int;
    pub fn posix_spawnattr_getflags(attr: *const posix_spawnattr_t, flags: *mut c_short) -> c_int;
    pub fn posix_spawnattr_setflags(attr: *mut posix_spawnattr_t, flags: c_short) -> c_int;
    pub fn posix_spawnattr_getpgroup(
        attr: *const posix_spawnattr_t,
        flags: *mut crate::pid_t,
    ) -> c_int;
    pub fn posix_spawnattr_setpgroup(attr: *mut posix_spawnattr_t, flags: crate::pid_t) -> c_int;
    pub fn posix_spawnattr_getschedpolicy(
        attr: *const posix_spawnattr_t,
        flags: *mut c_int,
    ) -> c_int;
    pub fn posix_spawnattr_setschedpolicy(attr: *mut posix_spawnattr_t, flags: c_int) -> c_int;
    pub fn posix_spawnattr_getschedparam(
        attr: *const posix_spawnattr_t,
        param: *mut crate::sched_param,
    ) -> c_int;
    pub fn posix_spawnattr_setschedparam(
        attr: *mut posix_spawnattr_t,
        param: *const crate::sched_param,
    ) -> c_int;

    pub fn posix_spawn_file_actions_init(actions: *mut posix_spawn_file_actions_t) -> c_int;
    pub fn posix_spawn_file_actions_destroy(actions: *mut posix_spawn_file_actions_t) -> c_int;
    pub fn posix_spawn_file_actions_addopen(
        actions: *mut posix_spawn_file_actions_t,
        fd: c_int,
        path: *const c_char,
        oflag: c_int,
        mode: crate::mode_t,
    ) -> c_int;
    pub fn posix_spawn_file_actions_addclose(
        actions: *mut posix_spawn_file_actions_t,
        fd: c_int,
    ) -> c_int;
    pub fn posix_spawn_file_actions_adddup2(
        actions: *mut posix_spawn_file_actions_t,
        fd: c_int,
        newfd: c_int,
    ) -> c_int;
}

#[link(name = "rt")]
extern "C" {
    pub fn mq_close(mqd: crate::mqd_t) -> c_int;
    pub fn mq_getattr(mqd: crate::mqd_t, attr: *mut crate::mq_attr) -> c_int;
    pub fn mq_notify(mqd: crate::mqd_t, notification: *const crate::sigevent) -> c_int;
    pub fn mq_open(name: *const c_char, oflag: c_int, ...) -> crate::mqd_t;
    pub fn mq_receive(
        mqd: crate::mqd_t,
        msg_ptr: *mut c_char,
        msg_len: size_t,
        msg_prio: *mut c_uint,
    ) -> ssize_t;
    pub fn mq_send(
        mqd: crate::mqd_t,
        msg_ptr: *const c_char,
        msg_len: size_t,
        msg_prio: c_uint,
    ) -> c_int;
    pub fn mq_setattr(
        mqd: crate::mqd_t,
        newattr: *const crate::mq_attr,
        oldattr: *mut crate::mq_attr,
    ) -> c_int;
    pub fn mq_timedreceive(
        mqd: crate::mqd_t,
        msg_ptr: *mut c_char,
        msg_len: size_t,
        msg_prio: *mut c_uint,
        abs_timeout: *const crate::timespec,
    ) -> ssize_t;
    pub fn mq_timedsend(
        mqd: crate::mqd_t,
        msg_ptr: *const c_char,
        msg_len: size_t,
        msg_prio: c_uint,
        abs_timeout: *const crate::timespec,
    ) -> c_int;
    pub fn mq_unlink(name: *const c_char) -> c_int;

    pub fn getrandom(buf: *mut c_void, buflen: size_t, flags: c_uint) -> ssize_t;
    pub fn getentropy(buf: *mut c_void, buflen: size_t) -> c_int;
}

#[link(name = "util")]
extern "C" {
    pub fn openpty(
        amaster: *mut c_int,
        aslave: *mut c_int,
        name: *mut c_char,
        termp: *mut termios,
        winp: *mut crate::winsize,
    ) -> c_int;
    pub fn forkpty(
        amaster: *mut c_int,
        name: *mut c_char,
        termp: *mut termios,
        winp: *mut crate::winsize,
    ) -> crate::pid_t;
    pub fn login_tty(fd: c_int) -> c_int;
    pub fn fparseln(
        stream: *mut crate::FILE,
        len: *mut size_t,
        lineno: *mut size_t,
        delim: *const c_char,
        flags: c_int,
    ) -> *mut c_char;
}

#[link(name = "execinfo")]
extern "C" {
    pub fn backtrace(addrlist: *mut *mut c_void, len: size_t) -> size_t;
    pub fn backtrace_symbols(addrlist: *const *mut c_void, len: size_t) -> *mut *mut c_char;
    pub fn backtrace_symbols_fd(addrlist: *const *mut c_void, len: size_t, fd: c_int) -> c_int;
}

#[link(name = "kvm")]
extern "C" {
    pub fn kvm_open(
        execfile: *const c_char,
        corefile: *const c_char,
        swapfile: *const c_char,
        flags: c_int,
        errstr: *const c_char,
    ) -> *mut crate::kvm_t;
    pub fn kvm_close(kd: *mut crate::kvm_t) -> c_int;
    pub fn kvm_getprocs(
        kd: *mut crate::kvm_t,
        op: c_int,
        arg: c_int,
        cnt: *mut c_int,
    ) -> *mut crate::kinfo_proc;
    pub fn kvm_getloadavg(kd: *mut kvm_t, loadavg: *mut c_double, nelem: c_int) -> c_int;
    pub fn kvm_openfiles(
        execfile: *const c_char,
        corefile: *const c_char,
        swapfile: *const c_char,
        flags: c_int,
        errbuf: *mut c_char,
    ) -> *mut crate::kvm_t;
    pub fn kvm_read(
        kd: *mut crate::kvm_t,
        addr: c_ulong,
        buf: *mut c_void,
        nbytes: size_t,
    ) -> ssize_t;
    pub fn kvm_write(
        kd: *mut crate::kvm_t,
        addr: c_ulong,
        buf: *const c_void,
        nbytes: size_t,
    ) -> ssize_t;
}

cfg_if! {
    if #[cfg(target_os = "freebsd")] {
        mod freebsd;
        pub use self::freebsd::*;
    } else if #[cfg(target_os = "dragonfly")] {
        mod dragonfly;
        pub use self::dragonfly::*;
    } else {
        // ...
    }
}
